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Real review comparing key specs to help you choose the best value for your power needs. Before you hit “buy,” check out these 142 specs & features — including real-world favorites like running wattage, starting wattage, fuel tank capacity & noise level. It’s the kind of detail pros care about.
A fast snapshot of the MaxWatt MX12500AS, covering its standout specification and what you can expect right out of the box.
MaxWatt MX12500AS
The MaxWatt MX12500AS is a high-capacity generator built for heavy-duty applications and whole-home backup scenarios. Its powerful engine supports large appliances, HVAC systems, and multiple devices simultaneously. Designed for durability and extended runtime, it's ideal for emergency preparedness and demanding environments.
Quick Specs Breakdown
The key specs that actually matter—no fluff, no guesswork
Here’s a streamlined view of the MaxWatt MX12500AS key specifications. Compare critical features at a glance before exploring the full specs and hands-on insights below.
Power & Electrical Output
Running Wattage
What is the running wattage?
9000 Watt
Starting Wattage
What is the starting wattage?
10000 Watt
Surge Handling Capability
How much surge can it handle?
12500 Watt
Voltage Output
What voltage does it output?
240 Volt
Engine & Fuel System
Fuel Tank Capacity
How large is the fuel tank?
10.57 gal
Displacement
What is the engine displacement?
457 cc
Engine Type
What type of engine does it use?
OHV
Noise & Emissions
Noise Level
What is the noise level of the generator?
82 dB
Dimensions & Weight
Weight
How much does the generator weigh?
243 lbs
Safety & Protection
Emergency Stop Switch
Is there an emergency stop switch?
Yes
Circuit Breaker Type
What type of circuit breaker does it use?
Thermal-Magnetic
General Information
Product Type
What type of generator is this?
Portable Generator
Controls & Connectivity
Control Panel Type
What type of control panel does it have?
Hybrid
Display Type
What type of display is included?
LED
Display Information Shown
What information is shown on the display?
Voltage,Frequency,Runtime
Specifications & Facts 142
Specs measured. Drama avoided.
Not just numbers on a box. We looked at how the MaxWatt MX12500AS actually performs with specs like running wattage, starting wattage, fuel tank capacity & noise level and others that users rely on daily.
When it comes to Total Harmonic Distortion (THD), MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 3.1 % measurement.
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MaxWatt MX12500AS Automatic Voltage Regulation
Does it regulate voltage automatically?
Yes 0Votes MaxWatt MX12500AS
Yes Generators in this range
MaxWatt MX12500AS
Automatic Voltage Regulation (AVR) is present (mapped value: Yes), helping stabilize output voltage under varying loads.
AVR improves compatibility with sensitive electrical equipment by reducing voltage fluctuations during load changes.
Maintains consistent voltage under varying loads.
When it comes to Automatic Voltage Regulation, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Continuous Load Capacity
What continuous load can it handle?
80 % 0Votes
132.64 % (Average)
MaxWatt MX12500AS
Continuous load capacity rating is 80% of the generator's rated output.
Operating around 80% continuous load is a common guideline to preserve engine life and avoid overheating.
The percentage of load the generator can handle continuously.
When it comes to Continuous Load Capacity, MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 52.6 % measurement.
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MaxWatt MX12500AS Outlet Types
What outlet types are included?
0 MaxWatt MX12500AS 0 Votes 240V
0 Generators in this range 120V, 240V
Describes the types of electrical outlets supported.
When it comes to Outlet Types, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Number of Power Outlets
How many outlets are available?
0 MaxWatt MX12500AS 0 Votes 6
0 Generators in this range 6
Counts the total available electrical outlets on the generator.
When it comes to Number of Power Outlets, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS DC Output
Does it support DC output?
No 0Votes MaxWatt MX12500AS
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Indicates whether the generator provides DC power output.
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MaxWatt MX12500AS USB Output
Are USB outputs included?
No 0Votes MaxWatt MX12500AS
generator in this range Who knows? (Help us out by suggesting one!)
Shows if USB ports are available for small devices.
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MaxWatt MX12500AS Parallel Capability
Can it run in parallel?
No 0Votes MaxWatt MX12500AS
generator in this range Who knows? (Help us out by suggesting one!)
Allows multiple generators to be connected together for more power.
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MaxWatt MX12500AS Power Factor
What is the power factor level?
0 MaxWatt MX12500AS 0 Votes Standard
0 Generators in this range Standard
Indicates the efficiency of power delivery from the generator to connected loads, expressed as a qualitative performance level rather than a numeric ratio.
When it comes to Power Factor, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Power Stability Rating
How stable is the power output?
0 MaxWatt MX12500AS 0 Votes Standard
0 Generators in this range Stable
Qualitative assessment of output consistency.
When it comes to Power Stability Rating, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Inverter Technology
Does it use inverter technology?
No 0Votes MaxWatt MX12500AS
generator in this range Who knows? (Help us out by suggesting one!)
Indicates whether inverter-based power generation is used.
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Defines the mechanical engine design used to generate power.
When it comes to Engine Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Fuel Type
What fuel does it use?
0 MaxWatt MX12500AS 0 Votes Gasoline
0 Generators in this range Gasoline
MaxWatt MX12500AS
Fuel type is Gasoline.
Running a generator on Gasoline affects storage, refueling logistics, and cold-weather behavior compared with diesel or propane options.
Specifies the type of fuel the generator operates on.
When it comes to Fuel Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Fuel Consumption Rate
How much fuel does it consume?
1.2 gal 0Votes
1.55 gal (Average)
MaxWatt MX12500AS
Rated fuel consumption is 1.2 gal (approximately 4.54 L) under typical load conditions.
Expect fuel use around 1.2 gal for estimating run time and refueling frequency.
Shows how quickly fuel is consumed during operation.
When it comes to Fuel Consumption Rate, MaxWatt MX12500AS ◉ is better than generator in this range ◉ , delivering higher 0.4 gal measurement.
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MaxWatt MX12500AS Oil Type
What oil type is recommended?
0 MaxWatt MX12500AS 0 Votes SAE 10W-30
0 Generators in this range SAE 10W-30
MaxWatt MX12500AS
Recommended oil type is SAE 10W-30.
Using SAE 10W-30 within the manufacturer's recommended temperature range ensures proper lubrication and engine longevity.
Specifies the recommended engine oil type.
When it comes to Oil Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Oil Capacity
How much oil does it hold?
1.1 qt 0Votes
2.07 qt (Average)
MaxWatt MX12500AS
Engine oil capacity is 1.1 qt (approximately 1.04 L).
Filling to the specified 1.1 qt helps maintain proper lubrication and avoid engine damage.
Shows how much oil the engine requires.
When it comes to Oil Capacity, MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 1.0 qt measurement.
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MaxWatt MX12500AS Low Oil Shutdown
Does it have low-oil shutdown?
Yes 0Votes MaxWatt MX12500AS
Yes Generators in this range
MaxWatt MX12500AS
Low oil shutdown is present (mapped value: Yes), which automatically stops the engine to prevent damage if oil pressure or level falls too low.
This protection helps avoid costly engine repairs due to oil starvation.
Automatically shuts down the engine if oil is low.
When it comes to Low Oil Shutdown, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Number of Cylinders
How many cylinders does it have?
0 MaxWatt MX12500AS 0 Votes 1
0 Generators in this range 1
States how many cylinders the engine has.
When it comes to Number of Cylinders, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Engine Brand Type
What engine brand type is used?
0 MaxWatt MX12500AS 0 Votes OEM
0 Generators in this range OEM
Indicates whether the engine is in-house or externally sourced.
When it comes to Engine Brand Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Runtime Performance
How is the runtime performance?
0 MaxWatt MX12500AS 0 Votes Long
0 Generators in this range Long
Describes the generator’s overall operating duration on a full fuel tank across typical load conditions, expressed as a qualitative runtime level.
When it comes to Runtime Performance, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Carburetor Type
What carburetor type is included?
0 MaxWatt MX12500AS 0 Votes Standard
0 Generators in this range Standard
Describes the carburetor configuration used.
When it comes to Carburetor Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Fuel Injection Type
Is it carbureted or fuel injected?
0 MaxWatt MX12500AS 0 Votes Carbureted
0 Generators in this range Carbureted
Indicates how fuel is delivered to the engine.
When it comes to Fuel Injection Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Fuel Gauge
Is there a fuel gauge?
Yes 0Votes MaxWatt MX12500AS
Yes Generators in this range
Displays the current fuel level in the tank.
When it comes to Fuel Gauge, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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Performance & Efficiency 13
MaxWatt MX12500AS Power to Weight Ratio
What is the power-to-weight ratio?
85 Watt 0Votes
79.91 Watt (Average)
MaxWatt MX12500AS
Power-to-weight listed as 85 Watt (value is given per the specification).
This 85 Watt figure helps compare how much power the unit provides relative to its mass when evaluating portability versus output.
Compares power output relative to generator weight.
When it comes to Power to Weight Ratio, MaxWatt MX12500AS ◉ is better than generator in this range ◉ , delivering higher 5.1 Watt measurement.
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MaxWatt MX12500AS Thermal Efficiency
What is the thermal efficiency?
28 % 0Votes
29.92 % (Average)
MaxWatt MX12500AS
Thermal efficiency is 28%, which indicates the percentage of fuel energy converted to usable mechanical/electrical power.
A 28% thermal efficiency is typical for small air‑cooled gasoline engines and impacts fuel economy.
Indicates how well heat energy is converted into mechanical power.
When it comes to Thermal Efficiency, MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 1.9 % measurement.
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MaxWatt MX12500AS Fuel Efficiency Rating
How fuel-efficient is the generator?
0 MaxWatt MX12500AS 0 Votes Moderate
0 Generators in this range Moderate
Overall assessment of how efficiently fuel is converted into power.
When it comes to Fuel Efficiency Rating, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Load Response Time
How fast does it respond to load changes?
2 sec 0Votes
2.78 sec (Average)
Time taken to stabilize output when load changes suddenly.
When it comes to Load Response Time, MaxWatt MX12500AS ◉ is better than generator in this range ◉ , delivering higher 0.8 sec measurement.
Don’t keep it to yourself — be the first to react and review the Load Response Time on MaxWatt MX12500AS ◉ and help others decide!
MaxWatt MX12500AS Voltage Stability Under Load
How stable is voltage under load?
0 MaxWatt MX12500AS 0 Votes Good
0 Generators in this range Excellent
Indicates how well voltage remains steady under varying loads.
When it comes to Voltage Stability Under Load, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Frequency Stability
How stable is the frequency output?
0 MaxWatt MX12500AS 0 Votes Stable
0 Generators in this range Stable
Measures consistency of output frequency during operation.
When it comes to Frequency Stability, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Maximum Continuous Operation Time
How long can it run continuously?
10 hours 0Votes
14.38 hours (Average)
Longest duration the generator can run continuously.
When it comes to Maximum Continuous Operation Time, MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 4.4 hours measurement.
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MaxWatt MX12500AS Eco Mode
Does the generator have eco mode?
No 0Votes MaxWatt MX12500AS
generator in this range Who knows? (Help us out by suggesting one!)
Automatically adjusts engine speed based on power demand to improve fuel efficiency, reduce noise, and extend runtime during low-load operation.
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MaxWatt MX12500AS Energy Conversion Type
What energy conversion type is used?
0 MaxWatt MX12500AS 0 Votes Electromechanical
0 Generators in this range Electromechanical
Describes how energy is converted into electricity.
When it comes to Energy Conversion Type, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Overload Recovery Time
How quickly does it recover from overload?
5 sec 0Votes
3.88 sec (Average)
Time required to recover normal output after overload.
When it comes to Overload Recovery Time, MaxWatt MX12500AS ◉ is worse than generator in this range ◉ , delivering equal 1.1 sec measurement.
Don’t keep it to yourself — be the first to react and review the Overload Recovery Time on MaxWatt MX12500AS ◉ and help others decide!
MaxWatt MX12500AS Start Reliability Rating
How reliable is starting?
0 MaxWatt MX12500AS 0 Votes Excellent
0 Generators in this range Excellent
Likelihood of successful starts under normal conditions.
When it comes to Start Reliability Rating, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Cold Start Performance
How does it perform in cold starts?
0 MaxWatt MX12500AS 0 Votes Enhanced
0 Generators in this range Enhanced
Indicates ease of starting in low temperatures.
When it comes to Cold Start Performance, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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MaxWatt MX12500AS Altitude Performance Rating
How does it perform at altitude?
0 MaxWatt MX12500AS 0 Votes Mid Altitude
0 Generators in this range Sea Level
Describes performance effectiveness at higher elevations.
When it comes to Altitude Performance Rating, MaxWatt MX12500AS ◉ is same as generator in this range ◉ .
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